Boring-bar.



4 Patented sept. 16,1302. w. A. Nl-:YLoN a .1. GUULDSBARBY. 1l

BORING BAH.

(Application med Oct. 19, 1901.)

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WILLIAM A.

NEYLON, OF ALLEGHENY, AND JOHN GOULDSBARRY, OF

MCKEES ROCKS, PENNSYLVANIA.

BORING-BAR.

SPECIFICATION forming part of Letters Patent No. 709,275, datedSeptember 16, 1902.

' Application filed October 19,1901. Serial No. 79,224. (No modelh Toa/ZL whom t may concern:

Beit known that we, WILLIAM A. NEYLON, residing at Allegheny, and JOHNGOULDS- BARRY, residing at McKees Rocks, in the county of Allegheny,State of Pennsylvania, citizens of the United States, have inventedcertain newand useful Improvements in Boring-Bars, of which thefollowing is a specification, reference being had therein to theaccompanying drawings, forming part of this specification, in which-Figure 1 is a view in side elevation of our improved boring-bar. Fig. 2is a front end View. Fig. 3 is a vertical longitudinal section onthe-line III III of Fig. 1. Fig. 4 is a cross-section on the line IV IVof Fig. 3.' Fig. 5 is a sectional view similar to Fig. 3, but showingthe cutters extended to Vtheir full limit. Fig. 6 is a cross-section onthe line VI VI of Fig. Fig. 7 is a detail view of one of the wedges.Fig. 8 is a cross-section on the line VIII VIII of Fig. 5. Fig. 9 is adetail View showing a modification dispensing with the separate wedges.

Our invention consists in an improvement in boring-bars, andisdesignedfor the purpose of providing a bar which is capable ofadjustment to varying gages of diameter and also of being adjusted tocompensate for the wear of the cutters, while embodying other featuresof advantage and novelty, as shall be more fully hereinafter set forth.

Referring to the drawings,.2 is the head of the boring-bar 3, which issecured and driven at its oppositeend in the manner usual with thisclass of tools. Mounted in a cylindrical cavity L in the head is acylindrical expanding block or plug 5, adapted to'make therein a neatfit and to be capable of longitudinal movement in and out, While througha central opening 6 in the block passes arigid rod or bolt 7, tapped orotherwise secured, as at 8,into the head 2. The outer end of this rodv 7is threaded, and upon it is mounted the adjusting-nut 9, fitting into arecess in the end of the expanding-block and secured therein by one ormore pins 10, tapped through the side of the block and projecting intoan annular groove l1 in the nut. The nut may,

however, be so arranged as to bear against the end of the block withoutrecessing it, and

in such arrangement or when recessed, as shown, may, if desired, beretained in position by other suitable means--as, forinstance, anannular flange and proper securing means therefor. As thus arranged theexpandingblock may be Inoved in or out of thehead by turning the nut upor down, which inward motion is for the purpose of expanding thecutters, while upon withdrawing the block the cutters may be set back.Such adjustment is secured through tapered Wedges 12, mounted incorresponding tapered ways or grooves 13 in the block of any desirednumber, the outer faces of the wedge being parallel to each other and tothe center of the head, whne their inner faces correspond to the taperedApitch of the bottom faces of the grooves upon which' the Wedges bearand make therewith a sliding fit. Iins 14, tapped in through the sidesof the head, fit slidinglyinto corresponding holes 15, so as to preventlongitudinal movement of the wedges and also to prevent rotation of theexpanding-block.

Suitable openings or apertures 16 are made in the side of the head 2,into which the inner ends of cutters 17 are introduced, such inner endsbearing against the outer parallel faces of the wedges 12 at whateverposition they may be set, so that it will be seen that by adj usting thewedges the exact position of the cutters will be accurately controlled,and when they are thus set to the desired position, so as to bore a holeof a determinate diameter, may be secured in position by setsorews 18.

In the drawings we have illustrated an arrangement of four cuttersequidistantly arranged in pairs, the bits of each pair being opposite toeach other, the other pair being at right angles thereto. A preferablearrangement, as shown, is to locate one pair somewhat in advance of theother, thus providing for making a roughing cut with the iirst pair,while the iinishing cut may be made with the second pair, at onecomplete operation. It will be understood that in such case the cutting.diameter of the rst pair will be slightly less than the back pair, andwhen thus arranged with relation to each other or when a single paironly is used, as may be done, the bits or cutters may be adjusted in IOOorout uniformly by adjustment of the nut 9. A further advantage oflocating one vpair in advancei of the other is that the front orroughing cutters may be ground back as they wear away clear to a linewith the cutting edges of the back pair without causing anyinterference, as it is evident that the roughing cut may be made in anyplane in front of the nishing cut. This feature-permitting regrinding ofthe bits-permits them to be used to exhaustion without necessity ofremoval and is a valuable feature of our invention. The advantages ofthis tool will be appreciated by all machinists and those familiar withmachine-shop practice. The cutters are comparatively short, inexpensive,readily inserted, easily removed for regrinding, or may be regroundWhile in position. The range of adjustment is very considerable and maybe proportioned to the character of the work in view. It' desired,suitable attachments may be made whereby the outward adjustment of thecutters may be done automatically, so that in making a long bore, as inthe case of gun-barrels and other similar mechanism, the diameter may bepreserved uniform` throughout. The number of cutters may be varied atwill, employing more or less than We'have shown, according to the workin view. Also, if desired, the separate wedges may be dispensed with andthe inner end of each cutter beveled off to interfit with the taperedface of the expanding-block, as indicated in Fig. 9, as well as otherchanges and modifications which may be made by the skilled lmechanicwithout departing from our invention, and

we desire toinclude all such changes as within the scope of thefollowing claims.

What we claim is- 1. A boring-bar provided with lateral recesses,cutters mounted therein, a central tapered expanding-block provided withlongitudinal Ways, wedgesv mounted in the ways and adapted to bearagainst the cutters, means for adjusting the block and means forsecuring the cutters.

2. A boring-bar providedwith lateral recesses, cutters mounted therein,a central rigid bar provided with adjusting means on its outer end, anexpanding-block mounted on the bar provided with tapered ways, andwedges mounted in the ways adapted to bear against/the cutters.

3. A boring-bar provided with lateral recesses, cutters mounted therein,a central rigid bar provided with adjusting means on its outer end, anexpanding-block mounted or. the bar provided with tapered ways, wedgestherein, and means for preventing longitudinal movement of the wedges.

4t. A boring-bar provided with lateral recesses, cutters mountedtherein, a central rigid bar provided with adjusting means on its outerend, an expanding-block mounted on the bar provided with tapered ways,wedges therein, means for securing the cutters, and means for preventinglongitudinal movement of the wedges.

5. In a boring-bar, the combination ofa bar provided with a cylindricalhead having a cylindrical longitudinal cavity, lateral recessesextending through the sides of the head, cutters mounted therein,set-screws mounted in the head adapted to bear on the cutters, a smoothcentral longitudinal stem rigidly secured in the head and threaded atits outer end, a cylindrical expanding-block slidingly mounted on thestern, having a bearing for its full length in the longitudinal cavityand provided with longitudinal tapered ways, au adjusting-nut on theouter threaded end of the stem rotatably inserted in the end of theblock provided with an annular groove, and securing-pins mounted in theblock and extending into said groove, substantially as set forth.

6. In a boring-bar, the combination of a bar provided with a cylindricalhead having a cylindrical longitudinal cavity, lateral recessesextending through the sides of the head, pairs of cutters mounted in therecesses, one of such pairs being in advance of the other, set-screwsmounted in the head adapted to bear on the cutters, a smooth centrallongitudinal stem rigidly secured in the head and threaded at its outerend, a cylindrical expanding-block slidingly mounted on the stein,having a bearing for its full length in the longitudinal cavity andprovided with longitudinal tapered ways, an adjusting-nut on the outerthreaded end of the stem, rotatably inserted in the end of the block,provided with an annular groove, and securingL pins mounted in the blockand extending into said groove, substantially as set forth.

In' testimony whereof We affix our signatures in presence of twowitnesses.

WILLIAM A. NEYLON. Y JOHN GOULDSBARRY. Witnesses:

JAMES M. DUFFY, HUMPHREY LYNCH.

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